Abstract
Evaluations were conducted using the Taguchi method to optimize a novel triple tube evaporator-based organic Rankine cycle combined heat and power (ORC-CHP) system. A triple tube system replaced the modified ORC evaporators with hot fluids at the inner annular, normal fluid in the outer annular with R152a, R600a, R32, and isopentane working fluids in the inner tube. Effects of net work done, total irreversibility, exergetic efficiency on pinch point temperature difference (PPTD), evaporator, and condenser temperature for the modified ORC-CHP system using Taguchi, L16 orthogonal array have been investigated. Results revealed that refrigerant R600a may have a more favorable performance for the innovative ORC-CHP system at higher evaporator temperatures. PI is very low for R32 and very high for isopentane at all values of condenser temperature for the ORC-CHP system. Maximum exergetic efficiency is 49.59% in the case of R32 at 45°C evaporator temperature. Taguchi's study shows that the enhanced ORC-CHP system's energetic efficiency and performance index are best optimized by evaporation temperature. Therefore, the novel ORC-CHP system operates better with R600a working fluid in the triple tube-based evaporator system. This research helps triple tube evaporators overcome the barriers and bridge the technological gap limiting their use.
